Combined feed-water heater and spark arrester



March 25 19240 A. ANDERBERG COMBINED FEED WATER HEATER AND SPARK ARRESTER 1921 2 Sheets-Sheet 1 Filed May '7 Mars 25, 1924;

1,488,188 A. ANDERBERG COMBINED FEED WATER HEATER AND SPARK ARRESTER Filed May 7, 1921 2 Sheets-Show. 2

Faten'ted Mar. 25, E924 COMBINED FEED-WATER AETLD 552 Application filed May 7,

To aZZ whom it may 00mm.-

Be it known that I, f-rNnnRs jinnnnsnno, citizen of Swedei'i, and residing at Mahno, in the Kingdom of Sweden, have invented certain new and useful Improvements in Combined Feedid' ater Heaters and Spark Ari-esters, of which the following is a specitication.

The present invention relates to combined feed water heaters and water cooled spark arresters for locomotive boilers or the like of the kind in which series or sets of horizontal or substantially horizontal pipes are arranged in the smoke box of the boilers, through which'pipes the feed water is allowed to pass before entering into the boiler.

The object of the invention is to increase the efliciency of such machinery by a special arrangement of the pipes in relation to the path of the flue gases through the smoke box, simultaneously as slime and impurities in the feed water are substantially prevented from settling in the pipes and these can be taken care of and cleaned without ditiiculty.

In the accompanying drawings Fig. 1 is a vertical section through the apparatus mounted in the smoke box of a locomotive boilers. F 2 is a plan view of the same.

The apparatus consists in a known way of groups or series of horizontal circular pipes arranged concentric in relation to each other and to the smoke stack, and these pipes are arranged in rows displaced in relation to each other as well vertically as horizontally in such away that the fine gases when passing to the tunnel are compelled intimately to sweep around the different pipes, thereby delivering their heat to the feed water circulating through the pipes and ext-inguishing sparks contained in the gases when coming into contact with the pipes cooled by the feed water. The number of pipes in each row may be adapted according to cir cumstances, and the number of rows may also vary in the same manner.

According to the invention the curved pipes 1 are fastened with their ends into tube plates 2 which are bolted together two by two using a suitable intermediate packing material in such a way that they connect the different curved pipes 1 to form a number of spiral or helical conduits leading from the top to the bottom of the ap paratus. By means of these detachably connected tube plates the pipe system of the apparatus is divided into a number of sec- 1921. Serial No. 46?,633.

tions easily detachable from each other, and

the form shown in the drawing has three such sections. It is, however, obvious that any other numi'ier of sections may be used. This division in s serves the purpose making it possible e entirely to clean the pipes on their inner sine and also to arrange the pipes in relation to the path of the fuel gases and the water circulation in such a way thatthe heat of the flue gases will be effectively utilized and the eliiciency of the apparatus increased. ii certain. number of the helical conduits is at the bottom connected with a water chest 3 communicating with said pipes, and the. rest of the pipes with a similar water chest i1, while all the pipes at the top are connected with common water chest 5. The inlet and outlet pipes for the feed water are connected with the water chests 3 and a The water is preferably supplied through the pipe 6 to the water chest 3 communicating with the innermost coils and leaves the apparatus through the pipe 7 from the water chest a communicating with the outermost coils. ihe apparatus may also be provided with an outlet at the top and an inlet at the bottom or vice versa, and the "feed water may also pass through the apparatus in diflerent ways without diverging from the char acteristic features of the invention. It the water is supplied to the chest 8 it is compelled to rise in a helical path through the inner coils and to pass downwards also in a helical path through the outer coils, the water and the flue gases passing in counterurrent in relation to each other in such a way that the flue gases already partly cooled by contact with the outer coils meet the cold water, while the water leaving the apparatus through the outer coils meets the hot flue gases, which are not yet cooled, and thus will be heated to a temperature approaching the temperature of the flue gases not yet cooled.

By using pipes of suitable dimensions and a suitable number in each set the total cross sectional area of each set of pipes may be equal or almost equal to the cross section of the pipes leading the *ater to and from the apparatus. Hereby the advantage is obtained that the stream of water in the pipes of the apparatus has about the same velocity as in the inlet and outlet pipes so that deposits of mud in the apparatus will be prevented or reduced to a minimum. If

of pipes or by boring through the same.

through an opening ordinarily closed by a.

plug 9 or the like. If only one of these cocks or plugs 8 is opened only the pipes debouching into the corresponding lower water chest are blown through, but ii both plugs 8 are opened sinniltaneously the whole system of pipes will b blown through. When a more efiicacious cleaning is desired the cover of the upper chamber or water chest 5 is removed and a suitable bent jet nozzle may be inserted in the pipes for separate cleaning. In the manner described the cleaning process can be made more or less eiIective and the apparatus in most cases can be thoroughly cleaned only by blowing water through. the same.

In order to remove such deposits that can not be removed by blowing water through the pipes the apparatus is taken apart, whereaiter each curved pipe can be bored through by means of a suitably driven flexible shaft carrying a suitable tool.

For the purpose of cleaning the pipes externally'the sheets 10 provided under the sets of pipes for carrying the flue gases towards the circumference of the apparatus, be'tore they pass between the pipes, are provided with hinges at their inner edges in such a way that they may be dropped, thus 7 making the pipes easily accessible from below "for cleaning purposes.

Having thus described my invention what I claim and desire to secure by Letters Patent is A combined feed water heater and water cooled spark arrester, comprising independent groups of substantially horizontally arranged curved pipes, adapted to bev positioned in the smoke box of the boiler and concentric to the smoke stack, tube plates connecting the ends of the curved pipes together to form a plurality of helical conduits extending from the top to the bottom of the heater, a water chest provided with a feed Water inlet and in communication at the bottom of the heater with the inner helical conduits, a water chest provided with a feed water outlet and in communication with a plurality of outer helical conduits, and a water chest at the top of the heater in communication with all of said conduits.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ANDERS. ANDERBEBG.

Witnesses G. PETERSSON, G. BRANZELL. 

